Welcome to the home page of the Cloud Physics Group in the Department of Land, Air, and Water Resources at the University of California, Davis. We study clouds. This includes everything from your everyday, puffy cumulus clouds to thunderstorms and large cloud systems like extratropical cyclones. We are particularly interested in how the properties of individual cloud droplets and ice crystals impact our weather and climate including how much precipitation falls, where it falls, and how sunlight and heat are distributed in the atmosphere. Aerosol particles play a role in determining these cloud properties, and much of my work in the past has focused on aerosol-cloud interactions. We primarily use atmospheric models to address research questions related to these topics. We are also interested in developing and improving these models in order to create better research tools and better weather and climate forecasts.